围带
叶轮
泄漏(经济)
迷宫式密封
机械
叶尖间隙
涡轮机
气体压缩机
压缩空气
材料科学
压缩空气储能
机械工程
涡轮机械
工程类
海洋工程
储能
物理
功率(物理)
热力学
宏观经济学
经济
作者
Ziyi Shao,Wen Li,Xing Wang,Xuehui Zhang,Haisheng Chen
出处
期刊:Journal of engineering for gas turbines and power
[ASME International]
日期:2020-06-30
卷期号:142 (7)
被引量:6
摘要
Abstract As an important energy generation device of the compressed air energy storage (CAES) system, the radial-inflow turbine with shrouded impeller is employed to avoid the leakage flow in the rotor, especially in the high-pressure stages. However, a lack of clarity in the leakage characteristics and their drivers still prevents a systematic approach to the efficient performance and proper design of the shrouded radial turbine. In the present work, the shroud cavity leakage of the shrouded radial turbine has been studied numerically. The physical quantity synergy is innovatively employed to research the internal flow field of the shroud cavity. It is found that the influence of high rotating speed on the seal leakage cannot be neglected, and the average reduced rate of seal leakage is found to be about 9.9% for the designed clearance. The leakage mass flow rate could be reduced by increasing the rotating speed or decreasing the seal clearance. The synergy angle is able to predict the flow resistance in shroud cavity very well. According to the volume-averaged synergy angle in the seal, the dimensionless seal clearance smaller than 1.5% in the shrouded radial turbine is recommended. Compared with the seal clearance in other high-pressure shrouded turbomachines, the current recommended clearance should be within a reasonable field.
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